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男性,75岁,因"腹痛、腹胀,恶心、呕吐,停止肛门排气、排便1周"。既往有左侧腹股沟疝手术史。查体:体温37.2℃,腹部平坦,对称,下腹部可见肠型及蠕动波,左腹股沟可见一长约5cm的手术瘢痕,腹部张力高,下腹部压痛明显,无反跳痛及肌紧张,肝脾肋下未及肿大,墨菲征阴性。腹部叩诊鼓音,肝浊音界位于右锁骨中线第5肋间,移动性浊音阴性,肠鸣音活跃,8次/分。
[提示] 查体:右侧腹股沟区可见一大小约2cm×5cm包块,质中,轻压痛,局部可闻及肠鸣音。根据患者病史及查体等情况,考虑患者小肠梗阻的原因最可能为( )
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